Answer:
The missing reason is Subtraction Property of Equality.
Step-by-step explanation:
⇒ (Given)
On Solving we get;
Multiplying 2 on both side we get;

⇒ (Multiplication Property of Equality)
Now Subtracting Both side by 10 we get;

⇒ (Subtraction Property of Equality)
Now Dividing both side by 3 we get;

⇒ (Division Property of Equality)
Hence the missing reason is Subtraction Property of Equality.
The nearest ten thousand is 20,000
The missing side would be B = 15
Answer:
I'm gonna guess and I don't know. I'm gonna go with C or A
7x+2y=-17
steps:
x=2x + 5x
y=3y - y
sum=-5 -12